Casio Computer Co., Ltd., with its headquarters in Tokyo, is a Japanese electronic device manufacturing company founded in 1946, Casio is best known for its calculators, audio equipment, PDAs, cameras, musical instruments, and watches.
In 1981 Casio began designing a new special kind of wristwatch, based on "Three x 10" concept: [1] Minimum 10 year battery life. [2] 10 Bar Water Resistance. [3] Withstand 10 meters freefall. This resulted in the "Gravity Shock" or G-Shock series wristwatch.
Casio Company has been well known for the wide variety and innovation of its wrist watches. It is one of the early manufacturers of Quartz-Crystal Watches, both digital and analog. It also sold a calculator watch at one time. It was one of the first manufacturers of watches that could display the time in many different time zones and of watches with temperature, atmospheric-pressure, and altitude displays.
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